Every chimney has some type of cover or crown that aims to prevent rain from dropping directly down the chimney. Most chimney crowns have angled surfaces designed to divert rain off their surfaces and away from the chimney.

How is rain kept out of chimney?

The chimney crown covers the top of the chimney to help protect it from the elements. The slanted crown should provide a downward slope that will allow for water runoff. This portion of the chimney prevents water from entering the flue, but also prevents wear and tear on the masonry.

How did old chimneys keep rain out?

Flashing is a tight strip inside your chimney that seals the seam between your roof and chimney to prevent water coming in. If the flashing is damaged or loses its seal due to age or wear and tear, water will get through the gaps. ... Metal flashings are preferred over mastic flashings.